Door closer and check.



PATENTED MAY 9, 1905.

W. M. DIZERu DOUR CLOSER AND CHECK APPLICATION FILED JUL! 18. 1904.

Z900 ara af lama-rm .17 67' Z5 M 7? UNITED STATES Patented May 9, 1905 PATENT OFFICE.

DOOR CLOSER AND CHECK.

SPECIFICATION formingpart of Letters Patent No. 789,656, dated May 9, 1905. Application filed July 18, 190(1- Serial No. 216,95'l.

To a, whom, it may concern.-

Be it known that 'I, WALTER M. DIZER, a citizen of the United States, residing at Brookline, in the county of Norfolk and State of Massachusetts, have invented anlmprovement in Door-Closers and Door-Checks, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention has for its object to improve the construction of pneumatic door closing and check mechanism wherein the door carries a cylinder containing a piston that is made effective in preventing the slamming of the door.

My improved door-check includes a cylinder fixed with relation to the door and containing a piston and a packed member movable therewith and having a stud or arm extended through a slot in the cylinder, said stud or arm being engaged by an arm attached to a rock-shaft with which coacts a spring, the spring being Wound by opening the door, and as the door is being opened the end of the arm insures the movement of the piston in the cylinder that air for a cushion may enter the cylinder and fill it between the packed member and one end of the cylinder. The cylinder has at its end nearest the hinged edge of the door a check-valve to regulate the outflow of the air from the cylinder, the imprisoned and slowlydischarged air acting as a cushion as the door is being closed by the spring referred to.

Figure 1 in perspective shows part of a door and door casing with my improved doorcloser and pneumatic check sustained in operative position, the door being closed. Fig. 2 shows the spring-casing in section. Fig.3 shows the cylinder in longitudinal section with its piston comprising a head and a connected packed disk having a valve, and Fig. 4 shows the right-hand face of the packed member.

The door, partially shown by the upright side edge a, top edge a, and panel a, and thedoor-frame I) b are and may be all as usual.

On the door-frame l secure by screws 0 a casing C, containing an upright central shaft 0, split most of its length, the split end of the shaft being extended through and above the cap 0 of the casing. The shaft has near its lower end a shoulder, (see Fig. 2,)and below said shoulder it is squared at 0 and provided with a threaded hole 0 (See Fig. 2.) Iinsert in the slot of the shaft before applying the cover the inner end of a fiat coiled spring 0 and engage the outer end of said spring with a slot 30 in the side wall of the casing. By inserting a screw-driver or other metal article in the slot of the shaft extended above the cap I may windthe spring to secure the tension desired, that depending on the weight of the door.- Thereafter I apply to the square lower end 0 of the shaft one end of the arm 0*, the opposite end o being shown as downturned, a screw 0 holding said arm on the shaft. The spring 0 acts normally to maintain said arm in such position thatits free end will contact with the door-casing. The spring is further wound by turning the arm when opening the door, and thereafter the spring serves to close the door.

In accordance with my invention I have combined with the arm and spring referred to a pneumatic device, which I will now describe, and Whose chief function is to check or prevent the door slamming when the latter'is closed by the spring, which may be as strong as desired.

The pneumatic check comprises a cylinder D, the ends of which are sustained in brackets d cl, provided with lugs having holes for the reception of screws by which to fix the cylinder to the door, said brackets also serving as heads to close the ends of said cylinder. Suitable washers of, Fig. 3, preferably of leather, may be interposed between the ends of the cylinder and the inner sides of the brackets, which latter may be threaded in order that the ends of the cylinder may be screwed thereinto, as in Fig. 3. The cylinder for about one-half its length has a longitudinal slot /2, formed therein. The bracket 6! has a boss provided with a hole (see Fig. 3) that receives an air check or device (Z shown as a screw having its shank split, a washer 03 being interposed between the head of the screw and the end of the boss.

By turning the screw and compressing the washer more or less it is possible to regulate the speed at which air when compressed in the right-hand end of the cylinder may be permitted to escape.

. The cylinder contains a piston shown as comprising ahead 6, a shaft 6, hollow for a greater or less part of its length, and a metallic disk e connected therewith and having a packinggland e and a flap-valve 6. (Best shown in Fig. 4E.) The outer face of the disk 6 sustains the flap-valve, said valve being unseated when the piston is being moved in the direction of the arrow, Fig. 3, and being closed when the piston is being moved in the opposite direction. The head 6 has a hole which receives a stud f, one end of which projects through the slot n, and said stud has a hole that receives loosely the end 0 of the arm o The spring 0 is-so arranged that when the door is opened said spring is wound up. Since the axis of the shaft 0 is offset from or out of line with the axis about which the door swings, the opening movement of the door will obviously cause the piston to advance in the cylinder to the left, during which movement the slot it becomes uncovered and air is drawn into the space between the packed member and the head 6 through the opening 20. When the door has been opened sufliciently, it is released, and immediately the spring 0 in the casing assumes control of the door to close the same, and in the final closing movement of the door by the spring the movement of the packed member is retarded by the air trapped between the right-hand face of the packed member, its flap-valve 6 being held closed by the air-pressure, and the time in which the spring 0 may close the door depends upon the adjustment of the check-valve referred to.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. A combination door-closer and pneumatic check, comprising av slotted cylinder adapted to be secured to a door, apiston within the cylinder, said piston having a head and a packed member connected by a stem, said packed member having an opening therethrough, a check-valve to close said opening, a stud secured to the head of the piston and projecting through the slot in the cylinder, and

a spring-actuated arm secured to the door-casing, said arm having its lower end bent downwardly and loosely passing through an aperture in the stud.

2. A combination door closer and pneumatic check, comprising a cylinder having a slot in its side, head's closing the ends of the cylinder, said heads having means for attachment toa door, a piston within the cylinder, said piston having a head and a'packed member connected by a stem, said stem having a bore which leads through the packed member, a check-valve for closing said bore, a stud secured to the head and projecting through the slot in the cylinder, and a spring-controlled arm adapted to be secured to the door-casing, said arm being loosely connected at one end to said stud.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALTER M. DIZER.

Witnesses:

JoHN C. EDWARDS, MARGARET A. DUNN. 

